Discrete Element Modeling of Groin Vault Displacement Capacity
Discrete Element Modeling of Groin Vault Displacement Capacity
复制标题
腹股沟拱顶位移能力的离散元建模
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Matthew J. DeJong
中科院分区：
文献类型：
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作者：
J. McInerney;Matthew J. DeJong
许多历史上的砌体结构所经历的位移集中在砌体接缝处，并且在倒塌之前可能很大，这使得使用离散元建模（DEM）进行稳定性建模特别合适。在这项研究中，砌体丁坝拱顶和拱模型与几种几何形状进行了水平和垂直的支持位移使用DEM。支持运动施加在一个准静态的方式来模拟支持的沉降过程。记录了坍塌时和第一块砖从拱顶上落下时的位移。在模拟过程中还注意到块分离和机制。一个二维（2D）的分析模型，使用推力线分析，以帮助评估DEM的结果。一般而言，第一次块体坠落时的位移相对较大，但明显小于崩塌时的位移。与水平位移相比，丁坝拱顶和拱具有更高的承受垂直支撑位移的能力。对于许多几何形状，比较合理，以及类似的拱的丁坝拱顶的DEM倒塌位移，表明丁坝拱顶的位移能力，可以合理地估计使用二维简化。然而，对于某些几何形状，三维效应被发现显着影响位移能力。
Displacements experienced by many historic masonry structures concentrate at masonry joints and can be large before collapse is a concern, making modeling of stability using discrete element modeling (DEM) particularly suitable. In this study, masonry groin vault and arch models with several geometries were subjected to horizontal and vertical support displacements using DEM. Support movements were applied in a quasi-static manner to simulate the support settlement process. Displacements at collapse and at the point when the first block fell from the vault were recorded. Block separation and mechanisms were also noted during the simulations. A two-dimensional (2D) analytical model using thrust line analysis was developed to help evaluate the DEM results. In general, the displacements at first block fall were relatively large but significantly less than those at collapse. The groin vaults and arches exhibited significantly higher capacity to sustain vertical support displacement compared to horizontal displacements. For many geometries, the DEM collapse displacements of the groin vaults compared reasonably well to similar arches, indicating that the displacement capacity of groin vaults can be reasonably estimated using 2D simplifications. However, for certain geometries, three-dimensional effects were found to significantly affect displacement capacity.